Détection acoustique sous-marine de neutrinos de ultra haute énergie dans le cadre de l'experience ANTARES

Abstract : We investigate the possibility to detect ultra high energy neutrinos (UHE, 10^18+ eV ) by the mean of underwater acoustic methods. This study is based on experimental measurements and, when none of those are available, on numerical simulations. The sea water acts as a target for neutrinos of cosmic origin. The electroweak interaction of high energy neutrinos with water molecules leads to a cascade of secondary particles resulting in the emission of an ultra-sonic impulse by a thermo-acoustic coupling mechanism. This mechanism is little efficient, however the generated signal has good propagation properties. Ambient sea noise, as well as the self noise of the ceramic transducers used for the detection, restrict the method to UHE. In addition, the strong directivity of the signal implies that location methods, by the detection in coincidence on multiple detectors, are little efficient. At extremely high energies (10^20+ eV) and for a single detector we estimate the sensitivity limit of this acoustic method to be of the order of E^2*phi=10^6 GeV*cm^-2*sr^-1*s^-1, for an astrophysical flux falling as 1/E^2.
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Valentin Niess. Détection acoustique sous-marine de neutrinos de ultra haute énergie dans le cadre de l'experience ANTARES. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université de la Méditerranée - Aix-Marseille II, 2005. Français. ⟨tel-00132273⟩

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